Remote control device especially for conveying, spraying and distributing machines for concrete and mortar

Abstract

The invention relates to a remote control device for mobile and stationary concrete pumps. The remote control device has a central control device to control groups and signalling units of the concrete pump and a remote control appliance connected to the central control device via a multicore remote control cable. The central control device has an emergency stop switch gear remote controlled by a mechanically actuatable emergency stop switch fitted in the remote control appliance, the power supply to which is taken via a forced first switch contact of the emergency stop switch and which triggers an emergency stop if the power supply fails. In order to ensure reliable emergency cut-off even in the event of a short circuit in the emergency stop system when the emergency stop switch is actuated, there is an overload fuse in the central control-side lead to the first switch contact designed as a break contact. In addition, there is in the emergency stop switch a second forced switch contact designed as a make contact, the first connection of which is connected to the ground terminal of the power source and the second connection of which is connected to the second connection of the first switch contact within the remote control appliance.

In the claims: 
     
       1. A switch device comprising: a remote control unit having a mechanically actuable emergency stop switch, said emergency stop switch including first and second switch contacts, each switch contact having first and second terminals, said emergency stop switch being adapted to cut-off operation of a machine even if power supplied thereto is interrupted;   a central control device for controlling parts and signalling elements of a machine, the central control device having an emergency stop switch device operatable by one of said emergency stop switch a key, the emergency stop switch device including a power supply connecting terminal;   a power supply having a positive pole and a ground pole, the positive pole being connected through a fuse to the first terminal of the first switch contact of the emergency stop switch; and   a multicore remote control cable connecting the central control device to the remote control unit;   the second terminal of the first switch contact being connected to the power supply connecting terminal of the emergency stop switch device, the first terminal of the second switch contact being connected to the ground pole of the power supply, the second terminal of the second switch contact being connected to the second terminal of the first switch contact;   the first switch contact of the emergency stop switch being adapted to break contact in an emergency stop and being connected at the first terminal through a first cable core of the remote control cable to the positive pole of the power supply, the second terminal of the first switch contact being connected through a second cable core of the remote control cable to the power supply connecting terminal of the emergency stop switch device, the second switch contact being adapted to make contact in an emergency stop, the first terminal of the second switch contact being connected through a third cable core of the remote control cable to the ground pole of the power supply, the first and the second switch contact being adapted to be forcedly guided and being adapted to react timely one after the other upon operation of the emergency stop switch.   
     
     
       2. The switch device according to claim 1, wherein the first and second switch contacts are combined in a changeover switch. 
     
     
       3. The switch device according to claim 1, wherein said power supply is a voltage source, said voltage source being housed in said central control device. 
     
     
       4. The switch device according to claim 3, wherein said first and second cable cores have a shielding cover connected to said ground pole. 
     
     
       5. A switch device comprising: a central control device for controlling parts and signalling elements of a machine, the central control device having an emergency stop switch device for signaling main and control circuits connected to stop operation of the parts and the signalling elements, the emergency stop switch device having a power supply terminal,   a mechanically actuable emergency stop switch being adapted to signal an emergency stop to the emergency stop switch device, the emergency stop switch having a switch contact,   a power supply supplying power to the central control and emergency stop switch, the power supply having positive and ground poles, the emergency stop switch being adapted to trigger an emergency cut-off upon interruption of the power supply, the power supply being housed in the central control device,   the switch contact having first and second terminals, the first terminal being connected through an overload fuse to the positive pole, the second terminal being connected to the power supply connecting terminal of the emergency stop switch device,   a remote control unit having a multicore remote control cable connected to the central control device, the emergency stop switch being arranged in the remote control unit, the first terminal of the switch contact of the emergency stop switch being connected through a first cable core of the remote control cable to the positive pole of the power supply and the second terminal being connected through a second cable core of the remote control cable to the power supply terminal of the emergency stop switch device, and   a shielding cover connected to the ground pole of the voltage source covering at least one of the first and second cable cores.   
     
     
       6. A device for controlling operation of a material distributing machine, comprising a central control device, a remote control unit, a multicore cable connecting said central control device and said remote control unit, and an electrical power supply having a positive pole and a ground pole, said central control device including circuits controlling parts of the machine and emergency stop device having means for manually stopping operation of the machine and having an output and a power supply terminal, said output of said emergency stop device being connected to said circuits,   said remote control unit including an emergency stop switch for stopping operation of the machine when power from the power supply is interrupted to said remote control device, said emergency stop switch having operation and stop positions and first and second switch contacts, said first switch having first and second terminals, said first and second terminals being electrically connected in the operation position of said emergency stop switch and being open circuited in the stop position of said emergency stop switch, said second switch contact having third and fourth terminals, said third and fourth terminals being open circuited in the operation position of said emergency stop switch and being electrically connected in the stop position of said emergency stop switch, said first terminal being connected to said positive pole of said electrical power supply through a first cable of said multicore cable, said second terminal being connected to said power supply terminal of said emergency stop device through a second cable of said multicore cable, said third terminal being connected to said ground pole through a third cable of said multicore cable, said fourth terminal being connected to said second terminal, and said second switch contact connecting the positive pole to the ground pole preventing electrical power from reaching said power supply terminal even if said multicore cable is shorted to stop operation of the machine when the emergency stop switch is in the stop position.   
     
     
       7. The device according to claim 6, wherein said central control device includes an overload fuse and a central stop switch, said fuse being connected between said positive pole and a fifth terminal of said central stop switch, and a sixth terminal of said central stop switch being connected to said first terminal of said first switch contact through said first cable.